Door-buffer.



A. S. NEWTON.

DOOR BUFFER.

APPLICATION FILED NOV. 4,1916- L l 1L 86k, Patented Jan. 9, 1917.

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DOOR-BUFFER.

Specification of Letters Patent.

Application fil ed November 4,1916. Serial, No. 129,412;

To all whom it mag concern: I

Be it known that I, ALBERT S. NEWTON, a citizen of the United States, residing at Providence; in the county of Providence and State of Rhode Island,-have invented certain new and useful Improvements in DoorBufi'ers, of which the following-is a specification. g

My invention-relates particularly to the type of door-bufler' particularly adapted for use with heavy doors and doors comprising glass panels, such, for instance, as th e d oors in public buildings and ofiice' buildings. Heretofore the exposed plunger tips of these devices have consisted of a rubber face or. plug which has proved unsatisfactory because mischievous or malicious persons destroy the tip either by prying it from its seat or cutting it ofi.

of parts as fall Within the scope of the appended claim.

In the accompanying drawings which form a part of this specification, Figure 1 is a plan view of my deviceattached to a base board and engaged by a door, the base board and door being broken away, Fig. 2 a longitudinal section of my buffer, Fig. 3, a rear elevation of the same, and Fig. 4, a detailed view of the plunger member.

Like reference characters indicate like parts throughout the views.

My construction in its present and approved form comprises a hollow cylindrical post 5 integral with the base 6 provided with apertures 7 for attaching screws 8 adapted to engage a base board 9 or other desired portion of a building. Near itsinner end, the portion of the post within the base is provlded with an internal screw thread 11, while near its outer end the interior bore of the post is of decreased diameter forming an internal annular shoulder 12. Within the bore 13 of the post the operative parts of the bufier are assembled.

1 These parts comprise a plunger member 14 slidably mounted in the post and in detail consist of a solid rounded head 15 projecting beyond the post and provided with an annular collar or shoulder 16 adapted to abut' against the stop shoulder 12. The body or shank l7 ofthe plunger extends some distance into the post, and is surrounded by a helical spring 18 which has one end abutting against the back of the head 15, and its opposite end resting against a metal disk or bearing plate 19 which is a sliding fit in the bore 13 of the post. In

' contact with this disk is a cylindrical abutment 20, also loose in the bore of the post, composed of a yielding material such as India rubber. The resistance of this mem- ,ber should exceed that of the spring since,

as it will be later seem-this member is intended for anabutment afterthe limit of action of the spring 18 has been reached.

'The member 20 is protected from abrasion by -the spring by the interposition of the disk 19. The member 20 abuts against the inner face of a plug'2l having an external thread 22 engaging in thread-11, and is pro-' vided with an angular central opening 23 extending. longitudinallylof the nut, adapted to receive a key or other implement for turning the plug, and is so constructed in order to render the assembled parts' more inaccessible, and toafford no projection to interfere with the face of the base board 9 Or other portion ofthe building.

The degree of tension upon the spring 18 is regulated and determined by the adjustment or turning of the member 21.

In the present instance, a. plate 25 is shown attached by screws 26 to a portion of the door 27 in such a position as to be adapted to contact with the head 15 of the plunger member 14 when the door is in open position.

When the door or plate in its movement contacts with the head 15, which projects some distance out of the end of the post, the plunger member moves inwardly pressin the spring 18 until the end of the shank 1 of the plunger comes in .contact with the disk 19, whereupon the force of the blow is taken up by the member 20, which yields lPatented Jan. 9, 121?. I

ter the glass in the door. It will be understood that in the case of heavy doors, the

. resistance which is afforded by the helical spring 18 must of necessity be suflicient merely to check the initial force of the door, or sufiicient to absorb only such force as is exerted by a very light contact of the door with the plunger, but in the'case of heavy doors or a lighter door moving with violence, a spring member alone is insufficient for the purposes desired.

I claim In a door-buffer, the combination of a hollow post, an internal shoulder near one end of the post, a plunger slidably mounted in the post comprising a head projecting from the post and a shank'within the post, a proection on the head engaging the shoulder, a

the post in contact With the plate, and a plug in the end of'the postengaging the abutment member.

In testimony whereof I have afiixed my signature in presence of two witnesses.

ALBERT S. NEWTON.

Witnesses:

HORATIO E. BELLOWS, MARY A. SULLIVAN. 

